Combined IFFT and FFT system

A system ( 12 ) for determining discrete transforms as between time and frequency domains. The system comprises a grid ( 60 ) comprising adders and multipliers. The grid is operable to perform in parallel an integer number P operations of a first transform function selected from one of either an IFFT or an FFT. The system also comprises the integer number of P serially-operating pipelines ( 64 1- 64 8). Each of the pipelines is coupled to the grid and is operable to perform serially over a number of cycles an integer number S operations of the first transform. In the system, S and P are both greater than one and, in combination, the grid and the serially-operating pipelines perform the first transform type as an SxP-point transform. In a first instance at least a portion of the grid is operable to perform IFFT operations. In a second instance at least a portion of the grid is operable to perform FFT operations.